Have to admit, i jumped the fence to aluminum heads. Current combo;
30 over 400 blk w/eagle crk(461 ci) Untouched 87cc's Crower RAIV cam w/1.65 rkrs. 10.2 cr "calculated" Have to find notes on cranking comp, but think it was 165-170
Been using 87 on the street for 2 years, and 93 at the track without a any issues. Got to love that!